Display screen or portion thereof with an animated graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with a first image in a sequence for an animated graphical user interface;

FIG. 2 is a front view of a display screen or portion thereof with a second image in a sequence for an animated graphical user interface; and,

FIG. 3 is a front view of a display screen or portion thereof with a third image in a sequence for an animated graphical user interface.

The outermost dot-dash broken lines and broken lines showing elements of the graphical user interface illustrate portions of the display screen and form no part of the claimed design. The slashed diagonal lines showing elements of the graphical user interface illustrate portions of the display screen and form no part of the claimed design. The appearance of the animated graphical user interface transitions sequentially between FIGS. 1-3 . The process or period in which one image transitions to another forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with an animated graphical user interface, as shown and described. 